Appendix
A.3 Connection Examples
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
554
Figure A-6 Busbar System with Low-resistance Earthing
Transformer connections to three voltage transformers (phase-to-earth voltages) and in each
case three CTs - earth fault detection as differential current measuring by two CT sets;
detection of displacement voltage at broken delta winding (da–dn) as additional criterion.
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